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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25031fad942770c673965b7b6cbdcfee0699b2a730e6da6fcfa78cee7f808386' 
  AND token = 'FsUrwO18IPWlT6xlg7WzTU/RFsZr170RIJ5mKeygL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}